Artificial breathing apparatus.



J. H. DRKGER. ARTIFICIAL BREATHING APPARATUS.

APPLICATION FILED 001". 1, 1908.

Patented J an. 7, 1913.

' aoaasie.

pnrran STATES PATENT oFFIoE.

J'OHANN HEINRICH DRAGER, F L'U'BEOK, GERMANY, ASSIGLNOR TO THE FIRM 0F DRAGERWERK, HEINR. & BERIVH. DRAGER, or LttBEoK, GERMANY.

ARTIFICIAL BREATHING APPARATUS.

Specification of Letters Patent.

Application filed Dctober 1, 1908. Serial No. 455,718.

To all whom it may concern:

Be it known that I, JOHANN' HEINRICH DRKGER, a subject of the Emperor of Germany, and resident of Liibeck, in the German Empire, have invented certain new and useful Improvements in Artificial Breath-' ing Apparatus, of which the following is'a specification. I

The present inventionrelates to improvements inapparatus for artificially causing people to breathe.

By the aid of a breathing apparatus air or some other suitable gas is forced into the breathing organs of the body and then drawn out again by suction in a way similar to natural breathing. Apparatus of thls' kind known heretofore difi'ers from the present apparatus inasmuch as 1n the present apparatus the air or gas conducting means for the alternate connection with the breathing organs are so arranged that the same gas driving means is used both for The apparatus consists of pipes e and P which branch from a pipe 72. in which an abutment 72 is fixed. The pipe e is provided with a throttling valve.

A pipe 1" branches ofl from the pipe 9 near its point of connection with the pipe h This pipe 1' leads to a bellows 1*, the

object of which is to move the pistons 71,

when it is necessary to change the course of the air. The bellows 7 may be connected directly with the piston rod i or by links m and n and a lever 13 hereinafter more fully described to operate the pistons i In the position shown, air or a m1xture of oxygen and air is driven to the lungs designated by a At the same time a portion of the air is led to the bellows r by way of the pipe 1", without aflecting the bellows on account of being too weak. When however,

Patented J an. 7, 1913. s

the lungs are filled the stream of air finds suflicient resistance to increase the pressure in the bellows 1*, which are now filled and act on the pistons i to change their position. The result is, that a sucking action takes place to draw air from the lungs and also from the bellows. As long as the lungs are able to give air, the sucking action does not increase to such an extent as to materially decrease the pressure in the bellows. When however, the lungs are exhausted the sucking action becomes stronger and the bellows contract so as to draw the pistons into the first position. The operation is then repeated.

It is not necessary to connect the bellows with the pipe 9 near the pipe k as shown, but they may be connected with the pipe k itself close to the pipe 9 or at some other place of the pipe 9 or with the mask or even with the pipe 9 If it is desired to impart a more sudden or quickmovement to the pistons than is possibleby the means above described the links 111, and n are provided with slots mand n respectively into which pins on the piston rod 2' and lever Z project; which latter is pivoted to some fixed point by a pin Z*. A second lever g is pivoted to a fixed point by a pin 9, one end of this lever 9 being acted upon by a spring 9 the tension of which may be regulated by a screw p The other end of the lever q carries a wedge shaped cam 0 having two surfaces 0 and 0 arranged at an angle to one another either of which bears against the free end of the lever Z by the pressure exerted by the spring p". The bellows are then expanded or contracted as long as the exhaling or the inhaling takes place. When the pressure or the vacuum in the bellows surpasses a certain degree, so as to move the lever Z beyond middle position the free end of it slides from the surface 0 to the surface 0 or vice versa, and by the -tension of the spring 1 the second surface standing at an angle to pipes,- and a bellows adapted to be movedby the com ressed gas and'by the suction to operate t e valve.

3. In an apparatus of the character described, means to ive ofi gas under ressure, pipes to con not the compresse gas and gas drawn by suction, a valve in the pipes,'a bellows ada ted to be moved by the -compressed gas an by the suction and ive ofi gas under pres-' means coo crating with the bellows to impart a su den movement to the valve.

4. In apparatus of the character described, means to 've ofi gas under ressure, pipes to con not the oompresse gas and gas drawn by suction, a valve in-the pipes, a bellows adapted to be moved by the compressed gas and by the suction to operate the valve, a lever in connection with the bellows, and 'a sprin -pressed Wedge-.

shaped cam acting on said ever to complete its motion and thereby operate the valve suddenly. n

J OHANN HEINRICH DRAGER. Witnesses: v

KARL BoLLMEYnR, JoHs. Wm. 

